Welcome to the community :).
Two of those are very tight next to each other inside a expansion card.
But there are quite a few available, for example here: https://www.digikey.com/en/products/filter/usb-dvi-hdmi-connectors/usb-dvi-hdmi-connector-assemblies/312?s=N4IgjCBcoEwBxVAYygMwIYBsDOBTANCAPZQDaIALGHAMwCcArCALqEAOALlCAMocBOASwB2AcxABfQgDY6iECkgYcBYmRA0YYMDDmFN2mhFYhO3PkLGSJEoA
Additionally I have just published a prototype design for such a expansion card, you can have a look if you want :). Dual USB-C Expansion Card - #470 by tbe
Not to discourage you but designing a USB 3 hub is not trivial, especially in that form factor.